Bobbin or spool



March 3, 1959 sHlzuo MORI ETAL 2,875,961 v BoBBIN 0R spoor.

Filed June 28, 1955 United States Patent O" BOBBI R SPOOL Shizuo Mori, 'Showa-ku, Nagoya-shi, and Shigeru Suzuki, Nishi-ku, Nagoya-shi, Japan, assignors to Toyo Rayon Co., Ltd., Tokyo, Japan, a Japanese company Application June 28, 1955, Serial No. 518,624 'Claims priority, application Japan July 21, 1954 3 Claims. (Cl. 242-118.32)

This invention relates to improvements in textile bobbins or spools and more particularly to textile bobbins or spools comprising an internal metal tube and an outer paper tube combined together, the top parts of both tubes being bent to form a device for holding an identification disk and the lower parts of them having a circumferential groove or a notch for engagement of a driving member.

The object of this invention is to provide bobbins or spools of simple construction which can be manufactured at 10W cost but secure satisfactory results in operation.

Another object of this invention is to provide bobbins or spools which do not spoil the thread being wound on the spool, and the outer tube of which can be replaced easily with a new one when it is spoiled or damaged.

A further object of this invention is to provide bobbins or spools comprising an outer paper tube and an inner metal tube which are combined together with no neces sity of auxiliary attachment members.

Other objects and advantages will become clear in the following descriptions made with reference to the accompanying drawings, which illustrate examples of the embodiments of this invention, but do not limit this invention.

ln the drawings:

Figure 1 is a side View of the bobbin or spool of this invention, partly shown in section; and Figure 2 is a similar view of the bobbin or spool of another embodiment of this invention, partly shown in section.

ln Fig. l, 1 designates a metal tube or wall of thin thickness and 2 a paper outer tube fitted over the outer surface of the metal tube 1. The upper prolongation of the paper tube 2 is bent as shown in the drawing to form a ring rim 3 having a section of a circle. The upper rim end of the metal tube is bent inwardly to form a flat end surface 4 which holds an identification disk 5 in cooperation with the ring rim 3 of the outer paper tube 2. The flat end surface 4 and the identification disk 5 have central holes 7 and 6 respectively. These holes are concentric and allow a spindle to pass through these holes. At the bottom of the tubes 1 and 2 is provided a notch 8 which engages a driving member (not shown) for the rotation of the bobbin or spool.

The embodiment of this invention illustrated in Fig. 2 is generally similar to the spool of Fig. l, excepting the fact that a circumferential groove 9 is provided on the surface of the lower part of said tube. Such a groove may contribute to fixing the two tubes firmly, and also may be utilized for winding the beginning portion of the thread separately from the rest.

2,875,961 Patented Mar. 3,y 1959 ice A bobbink or spool madeI ofv ametal" tube and a paper tube has been known, auxiliary attachment members for combination of the two tubes.

In the present invention, all the attachment members are eliminated by providing bent parts 3 and 4 at the ends of the two tubes 2 and 1 respectively. This makes the construction of the bobbin or the spool simpler, and consequently brings about lower cost of production. When the paper tube is spoiled by a long use, it is easy to replace the spoiled paper tube with a new one.

When attachment members are employed, it is necessary to pay special attention to the attachment of the two tubes by these members, inasmuch as smooth and satisfactory rotation of the bobbin cannot be secured if the attachment by the auxiliary attachment members are not carried out correctly, especially when the rotation is made at a high speed. Since in the present invention the attachment members are eliminated, there will be no disadvantage as described above.

In the present invention, no special additional members are required for fixing the identification disk 5 on which the size, the kind etc. of the thread are indicated, thanks to the ends of the two tubes being bent as illustrated in the drawings. This also being about advantageous in lowering the cost of production, making easier the replacement of a spoiled paper tube, and securing the smooth rotation of the bobbin.

It is well known in the art that when a bobbin of metal is used, the thread wound on the bobbin is sometimes spoiled due to the rust which may occur on the surface. It is also one of the disadvantages of a metal bobbin that the shape of wound thread is often disturbed by the slip between the thread and the metal surfaces. It is another disadvantage of a metal spool that it is comparatively heavy and difficult to secure light and smooth rotation.

In the present invention, the merits of the two materials, paper and metal, are obtained by the combination of tubes of the two materials without making the construction complicated.

The bobbin is comparatively light but still has suicient strength by the existence of the metal tube and the special bent ends of the tubes. The outer surface of the bobbin is of paper, and thus the disadvantages of a metal surface, such as spoiling of thread by rust of metal or the collapse or disturbance which may occur on the thread wound on the bobbin by the slip between the thread and the metal surfaces, may be completely eliminated. The metal tube is protected by the presence of the outer coating tube, which can be replaced easily, when spoiled, as described before.

When the circumferential groove 9 is provided as shown in Fig. 2, the groove made by squeezing the lower part of the tube will contribute to make the attachment of the two tubes secure and firm. It will also be useful for winding the beginning end of the thread in the groove to separate it completely from the rest of the thread on the proper body of the bobbin, for example, for the use of a magazine creel.

What is claimed is:

1. A bobbin, with an identification disk, comprising an outer paper tube including a top end constituting a ring rim of circular section, and an inner metal tube but it is the practice to use some including a circular at end, the outer paper tube having an internal bore for accommodating the inner tube, and said ring rim and said circular iiat end holding therebetween the identification disk.

2. A bobbin as claimed in claim 1, in which the two tubes define corresponding notches adapted for engagement with a driving member which rotates the bobbin.

3. A bobbin as claimed in claim 1, in which the outer paper tube includes an inwardly directed boss forming an outer groove adapted for respectively engaging the inner metal tube/and engaging thread to be wound on the bobbin.v

References Cited in the le of this patent UNITED STATES PATENTS Pratt Nov. 19, Heymann Apr. 14, Hedeld Oct. 11, Atwood Mar. 3, Dunlop Feb. 2, Dunlop June 1,

FOREIGN-PATENTS Great Britain July 25,

Great Britain July 2, 

